A Rare Fancy Coloured Diamond and Diamond Ring


Of serpent design, the pear-shaped fancy dark grey-blue diamond, weighing 1.77 carats, pavé-set throughout with brilliant-cut diamonds, some of pink tint, diamonds approximately 2.00 carats total, ring size 5
|Accompanied by a GIA report stating that the 1.77 carat diamond is Natural Fancy Dark Grey-Blue colour and SI1 clarity. Report number 6183699669, dated 13 September 2017.1.77克拉天然暗彩灰藍色SI1淨度'海洋藍'鑽石配鑽石戒指其餘鑽石共重約2.00克拉,戒指尺寸5,附GIA證書Blue diamonds are extremely rare and are becoming rarer, with production dwindling to just a few dozen per year. For the last 100 years, the major source has been the Cullinan Mine in South Africa, while historically, blue diamonds have been found in India's Golconda mine which stopped producing diamonds over 300 years ago. Depending on the amount of boron captured inside the carbon structure during the diamond's initial formation deep within the earth's mantle millions of years ago, the resulting diamond will appear from a pale sunny sky blue to a deep ocean blue, with the more boron-heavy saturated blue being far more difficult to find than a pale blue type.France's King Louis XIV was one of the first known people to fall in love with blue diamonds and the first reference in history to a blue diamond pertains to the 145 carat blue diamond he bought in the 1660s that would one day become the 45 carat Hope Diamond (graded Deep Greyish Blue) that now resides in the Smithsonian Institute in Washington DC. 由於產量減少至寥寥可數,藍色鑽石越見珍稀。在過去的100年裡，主 要礦源來自南非的庫裡南（Cullinan）礦，而歷史上，在印度的戈爾 康達（Golconda）礦也曾發現藍色鑽石，但該礦在300多年前已停止 開採鑽石。 數百萬年前鑽石在地幔深處初始形成時期，根據碳原子結構內硼元素 的多少，鑽石會呈現出淡天藍色到深海洋藍色的色度，而其中有高飽 和度硼的濃郁藍色比淺藍色相對更為難尋。 法國路易十四國王是首批愛上藍色鑽石的擁戴者，歷史上第一次提到的藍色鑽石便是他在1660年代購得的145克拉藍色鑽石，後來成為45克拉的希望鑽石（評定為深灰藍色），現存放於華盛頓特區史密森學會。